As of Wednesday, TriMet sold more than 21,700 mobile tickets and passes through the app, generating more than $100,000 in sales. There have been more than 16,000 downloads of the free app.

“We’re off to a remarkable start with the TriMet Tickets app as riders find mobile tickets convenient and easy to use,” said TriMet GM Neil McFarlane. “This is just the latest innovation we’ve implemented that benefits our riders, and the improvements will continue as we move toward an electronic fare system in the coming years.”

TriMet partnered with local software developer GlobeSherpa to create the app, the first to be used in the U.S. for riding both buses and trains, according to the transit system.

Each bus is equipped numerous safety features including security cameras, an audible safe turn alert system, and curbside and street-side turn aid lights, as well as a factory-installed driver’s barrier to increase bus operator safety.